Questions for reviewers

1. For getHistoricalEventCount why do missing input values return 0? Isn't this an error case? 0 is a meaningful return for both search types, but I wonder if changing this to -1 is a breaking change?
   

   aepsdk-core-ios/AEPCore/Sources/rules/JSONRulesParser.swift

   Lines 180 to 186 in c3727f6

   	func getHistoricalEventCount(parameters: [Any]?) -> Int {
   	guard let params = parameters,
   	let runtime = params[0] as? ExtensionRuntime,
   	let requestEvents = params[1] as? [EventHistoryRequest],
   	let searchType = params[2] as? EventHistorySearchType else {
   	return 0
   	}

Description

This PR adds unit test coverage for JSONCondition's getHistoricalEventCount method:

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.